Friendship

What kind of relationship can be called friends? How close should two best friends get? Recently, these kind of questions have kept badgering on my mind. A friend of my feels lonely all the time. He always needs friends to be accompanied with. Every meal of a day and whenever he feels alone, he would become very sad and depressed. He often cried for lack of friendship. As I observe the reason for his unhappiness, I found out that it was the feeling of insecurity makes him so sad. He desperately needs companions when he does things take more than one.